================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty read-write to 0xffff888137b4d1a0 of 8 bytes by task 22747 on cpu 0: __mark_inode_dirty+0x1ed/0x5f0 fs/fs-writeback.c:2403 generic_update_time fs/inode.c:1856 [inline] inode_update_time fs/inode.c:1869 [inline] touch_atime+0x1c4/0x2e0 fs/inode.c:1941 file_accessed include/linux/fs.h:2378 [inline] shmem_file_read_iter+0x54c/0x6b0 mm/shmem.c:2601 do_iter_readv_writev+0x27b/0x300 do_iter_read+0x16f/0x5d0 fs/read_write.c:787 vfs_iter_read+0x4c/0x70 fs/read_write.c:829 lo_read_simple drivers/block/loop.c:286 [inline] do_req_filebacked drivers/block/loop.c:499 [inline] loop_handle_cmd drivers/block/loop.c:1870 [inline] loop_process_work+0x77b/0x1350 drivers/block/loop.c:1910 loop_workfn+0x2d/0x40 drivers/block/loop.c:1934 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 read to 0xffff888137b4d1a0 of 8 bytes by task 24278 on cpu 1: __mark_inode_dirty+0xd5/0x5f0 fs/fs-writeback.c:2388 generic_update_time fs/inode.c:1856 [inline] inode_update_time fs/inode.c:1869 [inline] touch_atime+0x1c4/0x2e0 fs/inode.c:1941 file_accessed include/linux/fs.h:2378 [inline] shmem_file_read_iter+0x54c/0x6b0 mm/shmem.c:2601 do_iter_readv_writev+0x27b/0x300 do_iter_read+0x16f/0x5d0 fs/read_write.c:787 vfs_iter_read+0x4c/0x70 fs/read_write.c:829 lo_read_simple drivers/block/loop.c:286 [inline] do_req_filebacked drivers/block/loop.c:499 [inline] loop_handle_cmd drivers/block/loop.c:1870 [inline] loop_process_work+0x77b/0x1350 drivers/block/loop.c:1910 loop_rootcg_workfn+0x1b/0x20 drivers/block/loop.c:1941 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 value changed: 0x0000000000000000 -> 0x0000000000000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 24278 Comm: kworker/u4:5 Not tainted 5.18.0-rc2-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: loop3 loop_rootcg_workfn ==================================================================